May

2013

 * May 19, 2013 - Sky is introduced

2012

 * May 02, 2012 - Akako Shimizu is introduced
 * May 02, 2012 - Kagamine Renee and Kagamine Lenku are introduced

2009

 * May 14, 2009 - Nene Sotone is introduced
 * May 14, 2009 - Okurine Luka is introduced
 * May 29, 2009 - Nemui Taidane is introduced
 * May 16, 2009 - Midori Hatsune is introduced

2008

 * May 20, 2008 - Honne Dell is introduced
 * May 22, 2008 - Kagene Rei and Kagene Rui are introduced

Misc

 * May 27, 1997 - Birthdate of Ikeda Mai
 * May 12, 0000 - Brithdate of Namine Aki